munson



(No Model.)

J. s. MUNSON.

PIANO STOOL.

Patented June 26, 1883..

UNITED STATES PATENT OFFICE.

JULIUS S. MUNSON, OF BOSTON, MASSACHUSETTS, ASSIGNOR, BY MESNEASSIGNMENTS, TO KATHARINE MUNSON, OF SAME PLACE.

PIANO-STOOL.

SPECIFICATION forming part of Letters Patent No. 280,068, dated June 26,1883.

Application filed'Novemb er 1S, 1882. (No model.)

To all whom it may concern.-

Be it known that I, JULIUS S. MUNSON, a citizen of the United States,residing at Boston, in the county of Suffolk and State of Massachusetts,have invented certain new and use-- reference to the drawings, Figure 1representing a stool provided with my improvement; Fig. 2, a bottomplan, showing the preferred means of support for the arms and adjustableback, and Fig. 3 a detail enlarged.

The stool A is provided with lateral arms, having at the upper edgeshorizontal ways B, extending parallel to each other on each side of theseat, preferably a little above it, as in Fig. 1. Each arm is shown asformed with a shank, O, entering a socket, D, secured beneath the seatand fitting said shank closely, both being of such form as to preventthe shank turning. There may, if preferred, be a shank extendingdownwardly from each end of the horizontal part B.

The adjustable back E has secured to it, at each side, a bracket, F,adapted to slide back and forth on the upper surface, B, of each lateral arm, so as to change the location of the back when desired,bringing it well forward toward the middle of the seat when to be usedby a small child, or sliding it rearwardly for an adult, as denoted bydotted lines in Fig. 1. The brackets F are formed each with a verticallip or guide, 9, at the inner edge, 'serving to retain them in positionand provide for free movement on the ways B. Any convenient means ofsecuring the back when thus adjusted may be adopted, such as acam-lever, a ratchet,or a spring; but I prefer the device illustrated inthe drawings. The horizontal arms B are slotted, as at b, and throughthese slots shouldered thumb-screws H pass to enter threaded sockets inthe bottom of the brackets F. The screws, when slackened, traverse theslots, and form stops to control and limit the movement, that it shallnot be excessive, and when the screws are tightened the parts arerigidly secured together in the positions de-' sired. \Vith thisconstruction the arms are held with their shanks G' in the sockets 1)without other fastening, and the entire device, except the sockets, canbe removed byun screwing and taking out one or both of the thumb-screwsH, when the arms B O can be separately drawn from the readily replaced.

I am aware that reclining-chairs and other sea-ts have been furnishedwith hinged backs adjustable at various angles to the horizon by meansof said hinge; also, that removable backs not adjustable have beenprovided, and that backs mounted on springs, so as to yield topressureagainst them, have been proposed; but I am not aware of any stool havinga back adjustable by a sliding movement, without change in its angle tothe horizon, priorto my invention thereof.

I therefore claim as my invention- 1. A piano-stool having rigid lateralarms secured to it, in combination with a back held constantly at agiven angle, but adjustable horizontally by a sliding movement on saidarms, substantially as set forth.

2. The stool A, lateral arms B O, and sockets D, in'combination with theback E and its rigid brackets F, adjustable together horizontally uponsaid arms, and provided with looking devices, substantially as setforth.

3. The seat having lateral arms forming horizontal ways, and slotted, asat I), in combination with the sliding adjustable back, the brackets F,having lips g, and the thumbscrews H, for the purpose set forth.

In testimony whereof I hereto aflix my sig nature in presence of twowitnesses.

. JULIUS S. MUNSON.

lVitnesses:

KATHARINE G. MUNsoN,

A. H. SPENCER.

sockets and as.

